SignalPrep
Basic Qualification · B-003 Station assembly, practice and safety · B-003-002-006

Dans un émetteur FM, quel étage produit un harmonique utile?

  1. ALe multiplicateur de fréquence
  2. BLe modulateur
  3. CL'amplificateur de puissance
  4. DL'amplificateur microphonique

Correct answer: A — Le multiplicateur de fréquence. Question tirée de la banque officielle d'ISDE.

Why

A frequency multiplier is designed specifically to take an input signal and output a signal at a whole-number multiple of that frequency, creating useful harmonics to reach higher operating bands. The full explanation — and one for every question — is in Pro.

Practise this section

Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.

Drill B-003 — free, no account

This question in English · All B-003 questions